Retired police officer Robert Estrada III is accused of dealing drugs.Police said they just happened to stumble on the drugs while executing a search warrant that had nothing to do with the retired officer.Police said they found out about the narcotics when they responded to a domestic violence call involving Estrada's son.According to the criminal complaint, Robert Estrada Jr. assaulted his girlfriend with a gun then went to his parents house.Police were looking for a firearm, but instead investigators said they found meth and marijuana belonging to Robert Estrada III.Estrada retired from the police department about seven years ago.